Sawing apparatus.



PATENTED PEB. ll, 1908.

' E. T. DAVIES.

SAWING APPARATUS. APPLICATION HLED Now/x16. 1906.

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No. 879,088. PATBNTED 1888.11, 1908. 8. T. DAVIES. SAWING APPARATUS.

APPLICATION FILED NOV.16. 1906.

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W/TNESSES //.jjw EVAN T.. DAWES.

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SAWING- APPARATUS.

Specification of Letters Patent.

Patented Feb. 11, 1908.

.Application filed November 16. 1906. Serial No. 843.701.

To all whom, it may concern:

Be it known that I, EvAN T. DAvIEs, a citizen of the United States, and a resident of Portland, in the county of Multnomah and State of Oregon, have invented and useful Improvements in Sawing Apparatus, of which the following is a specification.

My invention is an improvement in sawing apparatus, and consists in certain novel constructions and combinations of parts as will be hereinafter' described and claimed.

In the drawings Figure l is a vertical cross-section on about line 5-5 of Fig. l. Fig. 2 is a detail face view partly broken in section of straining device. Fig. 3 is a detail vertical section on about line 7-7 of Fig. 2. Fig. 4 is a detail vertical section on about line SMS of Fig. 6. Fig. 5 is a detail top plan view of the carriage for the straining device, and Fig. 6 is a 'top plan view of the improvements, parts being broken away.

The band saw A is carried on wheels or pulleys E and F whose arbors E and F are mounted in boxesj' and e carried by the sec tions B and B2 of the saw frame. The boxes fare mounted in yokesf having Shanks slidable in the frame at one end thereof and. arranged to be set up to any desired position by means of the screw f2 passed through a bearing f" and having nuts on op* posite sides of said bearings so the boxes f may be adjusted as desired. The wheel or pulley F is weighted to form a balance wheel and drives the band, preferably by two belts applied to band pulleys E2 on the arbor e of the pulleys E. These two belts are applied from above to help counter-balance the saw frame. v

The saw straining gear means whereby the arbor of the pulley E may be set forward or back from the arbor of the pulley F, and comprises in connection with the yokes G carrying the boXes c for the arbor e, hollow shanks G movablelongitudinally in bearings g in the frame sections B and B and having at their inner ends threaded bearings at G2 to receive screw shafts H which being threaded` in the bearings G2 will when turned operate to move the yoke G relatively to the screw shaft H, and thus secure proper tension-between the said parts. This screw shaft may be turned in any suitable manner. As shown beveled pinions 7b are journaled in bearings in the device provides certain new and thus turn the saw frame illustrating the iadjusted toward their outermost frame B and have square bores 7L through which an angular portion on the screw shaft H may slide and be driven by bevel pinions 7b2 meshing with the pinion h to turn the same the screw shafts, as best shown in Fig. 2 of the drawings. Levers I are pivoted at one end I to one end of links I2, whose other ends are pivoted at I3 to the frame sections, and these levers I are connected at their other ends by connecting rods I4 to cranks J on a shaft J to which is connected a weighted lever J 2 whose weights J3 may be regulated according to the tension it is desired to put upon the band. `The levers I connect between their ends with their respective screw shafts H, such connection being preferably adjustable and effected by means of a collar I10 having studs I, see Fig. 3, pivoted to the side plates of the levers and nuts K threaded on the screw shaft H and projecting or sleeved in opposite directions into the opening I5 in the collar I10 about midway between the ends of the levers, the nuts being free to turn in the opening I5 so they may turn with the screw shaft H when adjusted thereon and having heads K at their outer ends bearing against the front and rear sides of the collar I10 to secure the same in connection with the screw shaft H.

Manifestly by turning these nuts K in either direction along the screw shaft H the point of connection of the lever I with the screw shaft may be varied and when the desired adjustment and alinement is secured, the nuts K may be locked in position by the jamnuts K2, as will be understood from Fig. 2 of the drawings.. By this means I am able to adjust the connection of the straining device with the shaft H and also to adjust the said shaft H relatively to its connection with the yoke carrying the boX for the arbor in order to secure the desired straining or tension of the saw in the operation of the invention.

When the yokes carrying the arbors e are positions they project considerable distance from their bearings g on the saw frame, and to support this overhanging projection I prefer to provide carriages P having rollers P running on a track P2 and a depending portion or hanger having side bars P3 extending down on opposite sides of the said track P2 and supporting at their lower ends collars P4 threaded on the shanks G and held thereto so the shanks G move out and in with the operation of the straining gear being suspended from the rollers P of the carriage P.

What I claim is- Y l. The combination of a su porting frame, a saw frame movable vertical y upon the supporting frame, means for moving the saw vertically, Wheels for supporting a band saw, a band saw on said wheels, an arbor supporting one of said pulleys, and straining devices for said arbor, comprising hollow shanks movable longitudinally in the saw frame and provided at their inner ends with threaded bearings means at the outer ends of said Shanks for supporting the arbor, a screw shaft screwed in the threaded bearing at the inner end of said tubular shanks, levers having openings receiving the screw shaft, nuts turning loosely within the said openings in the levers and threaded on the screw shaft and provided with heads abutting the opposite edges of the levers, swinging links connecting the upper ends of the levers with the saw frame, a shaft having cranks connected with the lower ends of the levers, and operating devices in connection with said shaft.

2. In a sawing apparatus a straining gear comprising a shank provided with arbor supporting means, a screw shaft connected with said shank, a lever having an opening receiving said screw shaft, and nuts turning loosely within said opening in the lever and threaded on the screw shaft.

3. The combination with a saw frame, a band saw, pulleys supporting said saw, and

arbors for said pulleys, of a straining gear in connection with one of said arbors, and comprising Shanks movable longitudinally in the saw frame, tension devices in connection with said shanks for forcing the same inwardly or outwardly to strain the band saw, carriages supporting the outer end of said shanks and tracks on which said carriages operate.

4. The combination of a saw frame, a band saw, means supporting the band saw including arbors, a straining device in connection with one of said arbors, and including tubular shanks movable longitudinally in the saw frame and provided at their outer ends with means for supporting said arbor, means for sustaining the weight of the outer ends of said shanks when extended, levers and connections between the same and their respective Shanks, and means for operating the levers whereby to put a strain upon the band saw.

5. The combination. substantially as described of the Shanks provided at their outer ends with means for supporting an arbor, and having threaded bearings at their inner ends, screw shafts threaded in said bearings, levers having openings through which the screw shafts extend, nuts threaded on the screw shafts and turning loosely Within the openings in the levers, and means for operating the levers.

EVAN T. DAVIES.

Witnesses:

SoLoN C. KEMON, PERRY B. TURPIN. 

